871662720721411 has 4 divisors (see below), whose sum is σ = 872153245608232. Its totient is φ = 871172195834592.

The previous prime is 871662720721391. The next prime is 871662720721433. The reversal of 871662720721411 is 114127027266178.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 871662720721411 - 2⁵ = 871662720721379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (871662720721811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245262440745 + ... + 245262444298.

It is an arithmetic number, because the mean of its divisors is an integer number (218038311402058).

Almost surely, 2^{871662720721411} is an apocalyptic number.

871662720721411 is a deficient number, since it is larger than the sum of its proper divisors (490524886821).

871662720721411 is a wasteful number, since it uses less digits than its factorization.

871662720721411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490524886820.

The product of its (nonzero) digits is 3161088, while the sum is 55.

Adding to 871662720721411 its reverse (114127027266178), we get a palindrome (985789747987589).

The spelling of 871662720721411 in words is "eight hundred seventy-one trillion, six hundred sixty-two billion, seven hundred twenty million, seven hundred twenty-one thousand, four hundred eleven".